Journal Article

PUBDB-2025-04492

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Universal Bound on the Duration of a Kination Era

Eröncel, C.DESY* ; Gouttenoire, Y.Extern* ; Sato, R.DESY* ; Servant, G.DESY* ; Simakachorn, P.Extern*

2025
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/k7ty-gwjg

Report No.: arXiv:2501.17226

Abstract: We show that primordial adiabatic curvature fluctuations generate an instability of the scalar field sourcing a kination era. We demonstrate that the generated higher Fourier modes constitute a radiationlike component dominating over the kination background after about 11 e-folds of cosmic expansion. Current constraints on the extra number of neutrino flavors Δ⁢𝑁$_{eff}$ thus imply the observational bound of approximately 10 e-folds, representing the most stringent bound to date on the stiffness of the equation of state of the pre–Big Bang–nucleosynthesis universe.

Note: 5 pages, 2 figures + appendix (10 pages)

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. DFG project G:(GEPRIS)390831469 - EXC 2118: Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA+) (390831469) (390831469)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)
3. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
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